LG Multi V 5 Commercial VRF Aircon CH79 Error Code
Use this LG Multi V 5 commercial VRF CH79 error code guide to capture the fault correctly and see what should be checked before parts are quoted. Read the final display digit: 1 identifies the master, 2 slave 1, and 3 slave 2.
What does LG CH79 mean?
LG Multi V 5 commercial VRF CH79 is listed as master outdoor unit: Outdoor-unit fan operation or position-sensor failure, slave 1 outdoor unit: Outdoor-unit fan operation or position-sensor failure, and slave 2 outdoor unit: Outdoor-unit fan operation or position-sensor failure in VRF, Cassette, Ducted rows such as LG Multi V 5 commercial VRF. The loaded row is source-backed by official diagnostic material. Use the complete display code and its final digit - 1 for master, 2 for slave 1, or 3 for slave 2 - to choose the reporting outdoor frame before parts are quoted. Confirm the complete display code and whether its final digit identifies the master, slave 1, or slave 2 outdoor frame before accepting a parts quote.
Choose the matching source row
The same visible code has more than one source-backed meaning. Match the model family, system type, or reporting unit before approving parts.
| Code | What it means | What to check first |
|---|---|---|
| 791 | master outdoor unit: Outdoor-unit fan operation or position-sensor failure | Use the complete 791 display for the master outdoor unit source row. |
| 792 | slave 1 outdoor unit: Outdoor-unit fan operation or position-sensor failure | Use the complete 792 display for the slave 1 outdoor unit source row. |
| 793 | slave 2 outdoor unit: Outdoor-unit fan operation or position-sensor failure | Use the complete 793 display for the slave 2 outdoor unit source row. |
- Code
- 791
- What it means
- master outdoor unit: Outdoor-unit fan operation or position-sensor failure
- What to check first
- Use the complete 791 display for the master outdoor unit source row.
- Code
- 792
- What it means
- slave 1 outdoor unit: Outdoor-unit fan operation or position-sensor failure
- What to check first
- Use the complete 792 display for the slave 1 outdoor unit source row.
- Code
- 793
- What it means
- slave 2 outdoor unit: Outdoor-unit fan operation or position-sensor failure
- What to check first
- Use the complete 793 display for the slave 2 outdoor unit source row.
What to do now
Use these steps before customer action or a parts quote.
Stop using the unit if CH79 returns
If CH79 remains displayed or returns during operation, do not attempt an unsourced reset; get the matching source row diagnosed.
No manufacturer reset steps listed for CH79
Capture the complete CH79 display and model stickers first. The selected source row lists no customer reset procedure; do not treat a generic power-cycle as manufacturer guidance.
Send these to us
CH79 error code, a clear display photo, LG Multi V 5 commercial VRF model stickers, affected rooms, operating state when the code appeared, and fan noise or no-airflow symptoms
Source-specific guidance
These diagnostic-reference notes help match the code to the exact model. Electrical, refrigerant, wiring, resistance, and component checks are technician work, not DIY steps.
| Source detail | What it says |
|---|---|
| Diagnostic note | Record 791 and confirm that the master outdoor unit reported it. Avoid repeated resets and arrange fan motor, connector, feedback, driver, and mechanical-obstruction checks. |
| Diagnostic note | Record 792 and confirm that the slave 1 outdoor unit reported it. Avoid repeated resets and arrange fan motor, connector, feedback, driver, and mechanical-obstruction checks. |
| Diagnostic note | Record 793 and confirm that the slave 2 outdoor unit reported it. Avoid repeated resets and arrange fan motor, connector, feedback, driver, and mechanical-obstruction checks. |
| Singapore / model note | LG Singapore lists Multi V 5, but the installed unit nameplate and matching service manual control. Do not apply this row to Multi V i or another LG family. |
- Source detail
- Diagnostic note
- What it says
- Record 791 and confirm that the master outdoor unit reported it. Avoid repeated resets and arrange fan motor, connector, feedback, driver, and mechanical-obstruction checks.
- Source detail
- Diagnostic note
- What it says
- Record 792 and confirm that the slave 1 outdoor unit reported it. Avoid repeated resets and arrange fan motor, connector, feedback, driver, and mechanical-obstruction checks.
- Source detail
- Diagnostic note
- What it says
- Record 793 and confirm that the slave 2 outdoor unit reported it. Avoid repeated resets and arrange fan motor, connector, feedback, driver, and mechanical-obstruction checks.
- Source detail
- Singapore / model note
- What it says
- LG Singapore lists Multi V 5, but the installed unit nameplate and matching service manual control. Do not apply this row to Multi V i or another LG family.
What to check before repair
Use this split to separate safe evidence capture from the tests a technician should prove before quoting parts.
| You can check | Technician should confirm |
|---|---|
| Before taking any system action on CH79, take a clear display photo. | Confirm whether CH79 points to the indoor fan, outdoor fan, or drive circuit. |
| Capture the LG Multi V 5 commercial VRF indoor and outdoor model stickers so the correct family row is used. | Check for blade obstruction, motor winding, feedback signal, and connector condition. |
| The selected source row lists no customer reset procedure. Note whether one room, several rooms, or the whole system is affected. | Confirm PCB fan-drive output before quoting a motor or board. |
- You can check
- Before taking any system action on CH79, take a clear display photo.
- Technician should confirm
- Confirm whether CH79 points to the indoor fan, outdoor fan, or drive circuit.
- You can check
- Capture the LG Multi V 5 commercial VRF indoor and outdoor model stickers so the correct family row is used.
- Technician should confirm
- Check for blade obstruction, motor winding, feedback signal, and connector condition.
- You can check
- The selected source row lists no customer reset procedure. Note whether one room, several rooms, or the whole system is affected.
- Technician should confirm
- Confirm PCB fan-drive output before quoting a motor or board.
Motor or board decision
LG Multi V 5 commercial VRF CH79 is repair-first when the motor, blade, or feedback circuit is confirmed. Replacement becomes relevant only if motor or board cost is poor value for the system age.
Obstruction or loose connectors are simpler than a failed motor or board output.
Motor replacement depends on whether feedback and winding tests confirm failure.
Board replacement should follow motor and harness checks, not replace them.
LG CH79 questions
What does the LG CH79 error mean?
Can I fix a LG CH79 error myself?
Is it safe to keep running the aircon with a CH79 error?
What causes a LG CH79 error?
Will a LG CH79 error need a repair or a full replacement?
What should I send a technician about a LG CH79 error?
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